Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (21 commits)
  [ARM] 3629/1: S3C24XX: fix missing bracket in regs-dsc.h
  [ARM] 3537/1: Rework DMA-bounce locking for finer granularity
  [ARM] 3601/1: i.MX/MX1 DMA error handling for signaled channels only
  [ARM] 3597/1: ixp4xx/nslu2: Board support for new LED subsystem
  [ARM] 3595/1: ixp4xx/nas100d: Board support for new LED subsystem
  [ARM] 3626/1: ARM EABI: fix syscall restarting
  [ARM] 3628/1: S3C24XX: add get_rate call to struct clk
  [ARM] 3627/1: S3C24XX: split s3c2410 clocks from core clocks
  [ARM] 3613/1: S3C2410: Add sysdev and sysclass
  [ARM] 3624/1: Report true modem control line states
  [ARM] 3620/2: ixp23xx: add uengine loader support
  [ARM] 3618/1: add defconfig for logicpd pxa270 card engine
  [ARM] 3617/1: ep93xx: fix slightly incorrect timer tick rate
  [ARM] 3616/1: fix timer handler wrap logic for a number of platforms
  [ARM] 3615/1: ixp23xx: use platform devices for physmap flash
  [ARM] 3614/1: ep93xx: use platform devices for physmap flash
  [ARM] 3621/1: fix compilation breakage for pnx4008
  [ARM] 3623/1: pnx4008: move GPIO-related defines to gpio.h
  [ARM] 3622/1: pnx4008: remove clk_use/clk_unuse
  [ARM] Enable VFP to be built when non-VFP capable CPUs are selected
  ...

1 files changed, 46 insertions, 25 deletions

diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 03486be..2476f4c 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -15,6 +15,8 @@
 #include <linux/signal.h>
 #include <linux/sched.h>
 #include <linux/init.h>
+
+#include <asm/thread_notify.h>
 #include <asm/vfp.h>
 
 #include "vfpinstr.h"
@@ -36,38 +38,55 @@ union vfp_state *last_VFP_context;
  */
 unsigned int VFP_arch;
 
-/*
- * Per-thread VFP initialisation.
- */
-void vfp_flush_thread(union vfp_state *vfp)
+static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
 {
-	memset(vfp, 0, sizeof(union vfp_state));
+	struct thread_info *thread = v;
+	union vfp_state *vfp = &thread->vfpstate;
 
-	vfp->hard.fpexc = FPEXC_ENABLE;
-	vfp->hard.fpscr = FPSCR_ROUND_NEAREST;
+	switch (cmd) {
+	case THREAD_NOTIFY_FLUSH:
+		/*
+		 * Per-thread VFP initialisation.
+		 */
+		memset(vfp, 0, sizeof(union vfp_state));
 
-	/*
-	 * Disable VFP to ensure we initialise it first.
-	 */
-	fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_ENABLE);
+		vfp->hard.fpexc = FPEXC_ENABLE;
+		vfp->hard.fpscr = FPSCR_ROUND_NEAREST;
 
-	/*
-	 * Ensure we don't try to overwrite our newly initialised
-	 * state information on the first fault.
-	 */
-	if (last_VFP_context == vfp)
-		last_VFP_context = NULL;
-}
+		/*
+		 * Disable VFP to ensure we initialise it first.
+		 */
+		fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_ENABLE);
 
-/*
- * Per-thread VFP cleanup.
- */
-void vfp_release_thread(union vfp_state *vfp)
-{
-	if (last_VFP_context == vfp)
-		last_VFP_context = NULL;
+		/*
+		 * FALLTHROUGH: Ensure we don't try to overwrite our newly
+		 * initialised state information on the first fault.
+		 */
+
+	case THREAD_NOTIFY_RELEASE:
+		/*
+		 * Per-thread VFP cleanup.
+		 */
+		if (last_VFP_context == vfp)
+			last_VFP_context = NULL;
+		break;
+
+	case THREAD_NOTIFY_SWITCH:
+		/*
+		 * Always disable VFP so we can lazily save/restore the
+		 * old state.
+		 */
+		fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_ENABLE);
+		break;
+	}
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block vfp_notifier_block = {
+	.notifier_call	= vfp_notifier,
+};
+
 /*
  * Raise a SIGFPE for the current process.
  * sicode describes the signal being raised.
@@ -281,6 +300,8 @@ static int __init vfp_init(void)
 			(vfpsid & FPSID_VARIANT_MASK) >> FPSID_VARIANT_BIT,
 			(vfpsid & FPSID_REV_MASK) >> FPSID_REV_BIT);
 		vfp_vector = vfp_support_entry;
+
+		thread_register_notifier(&vfp_notifier_block);
 	}
 	return 0;
 }